The US Mint occasionally strikes a coin that does not follow the route into general circulation but instead gets routed back into the strike of a different denomination. The result is always weird and sometimes beautiful--"striking," even!
Such is the case of two Lincoln cents struck on Roosevelt dimes on eBay. One is still for sale; the other just sold via auction.
This 1993 P penny-dime started as a dime before it was double-struck as a Lincoln cent. It is a Mint error that is graded MS 67 by NGC. The oak branch and torch on the back of the dime are evident on Abraham Lincoln's head and beard.
Turning the Lincoln Memorial on its side makes it easier to see the silhouette of Franklin D. Roosevelt.
The grade and the picture of the first coin make it obvious that the strike is much better on that coin than on the second. However, the leaves on Abraham Lincoln's face in the second double-denomination coin make that coin quite beautiful.